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package cn.chnmuseum.party.common.video;
import org.bytedeco.javacv.FFmpegFrameGrabber;
import org.bytedeco.javacv.Frame;
import org.bytedeco.javacv.Java2DFrameConverter;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
/**
* 截取视频图片
*/
public class FrameGrabberKit {
/**
* 获取指定视频的帧并保存为图片至指定目录
*/
public static InputStream fetchFrame(String videoUrl) throws Exception {
FFmpegFrameGrabber ff = new FFmpegFrameGrabber(videoUrl);
ff.start();
int lenght = ff.getLengthInFrames();
int i = 0;
int interceptionFrames = 30;//截取第几帧
//默认截取第50帧，如果第50帧大于视频总帧数的8成直接取长度lenght * 0.3
if (interceptionFrames >= lenght * 0.8) {
interceptionFrames = (int) (lenght * 0.3);
}
Frame f = null;
while (i < lenght) {
// 过滤 前 interceptionFrames 帧，避免出现全黑的图片，依自己情况而定
f = ff.grabFrame();
if ((i > interceptionFrames) && (f.image != null)) {
break;
}
i++;
}
int imageWidth = f.imageWidth;
int imageHeight = f.imageHeight;
// 对截取的帧进行等比例缩放
// int width = 800;
// int height = (int) (((double) width / owidth) * oheight);
Java2DFrameConverter converter = new Java2DFrameConverter();
BufferedImage fecthedImage = converter.getBufferedImage(f);
BufferedImage bi = new BufferedImage(imageWidth, imageHeight, BufferedImage.TYPE_3BYTE_BGR);
bi.getGraphics().drawImage(fecthedImage.getScaledInstance(imageWidth, imageHeight, Image.SCALE_SMOOTH), 0, 0, null);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ImageIO.write(bi, "png", baos);
InputStream inputStream = new ByteArrayInputStream(baos.toByteArray());
//ff.flush();
ff.stop();
return inputStream;
}
}